amyamyamy a écrit : je n'arrive pas à lire le lien mais merci d'avoir pensé à moi..
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=> "Is Glutamine Supplementation Helpful or Harmful?"
By Russell L. Blaylock, M.D.
Numerous recent studies as well as Siegel’s Basic Neurochemistry textbook emphatically state that the major source of glutamate is from glutamine in the brain. Normally, when the brain finishes using glutamate for chemical communication between brain cells at the synapse the glutamate is taken up by surrounding glial cells and changed by the enzyme glutamine synthease into glutamine, where it is stored.
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I never stated glutamine was an excitotoxin, but I do state that it is converted into the excitotoxin glutamate within neurons. Numerous recent studies as well as Siegel’s Basic Neurochemistry textbook emphatically state that the major source of glutamate is from glutamine in the brain. Normally, when the brain finishes using glutamate for chemical communication between brain cells at the synapse the glutamate is taken up by surrounding glial cells and changed by the enzyme glutamine synthease into glutamine, where it is stored.
The Problem With Excitotoxins
The glutamine is then transported to the neuron and by the enzyme glutaminase, it is converted to glutamate--the potential excitotoxin. I say potential because unless it accumulates outside the brain cell it is harmless.